[How to] Downgrade iOS 4.1 to 4.0 on iPhone & iPod Touch

iOS 4.1 beta was released late last night exclusively for the developers and we even posted the guide to jailbreak iOS 4.1 with redsn0w 0.9.5 beta 5 on iPhone 3G and iPod touch 2G (non-MC models). In case you feel you have made a mistake upgrading to iOS 4.1 beta and want to downgrade it to iOS 4.0, here is a guide to do that.

But keep in mind that by downgrading iOS 4.1 to 4.0, your baseband will remain the same and your iPhone will be locked if you are not on supported carrier. Hence unlockers must stay away from iOS 4.1 until iPhone dev team comes up with iOS 4.1 unlock tools.

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